VMware Optimization Assessment and Marginal Gains

Marginal gains theory is again in focus following the Rio Olympics. In sport where the margins between glory and disappointment are so slender, coaches look for opportunities to optimize athletes natural ability through small cumulative changes. For example in preparation for the 2016 games when Team GB coaches noticed that women track cyclists sometimes missed […]

vmware design math – calculate new cluster requirements

design math – calculate new cluster requirements Question 1   Inventory of 100 physical servers    75 Severs with 2 x 2 core 2.5GHZ intel CPU’s 25 Servers with 2 x 4 core 2.5GHZ intel CPU’s   75 Servers with 4GB of memory 25 Servers with 16GB of memory   Average peak CPU usage PER CORE on […]

vmware-design math – calculate vsan requirements

Here’s a math question based on the vsan design and sizing guide   Customer wants to deploy 100  virtual  machines in a hybrid Virtual SAN 6.0 cluster, disk format v2 Each virtual  machine requires  2  vCPU,  8GB  of  memory  and  a  single  100GB  VMDK. Snapshots are not used. Customer expect a vCPU-to-core ratio of 5:1 […]

vcix-dcv-design math – Get remaining host cpu capacity

Although these are typical question for vmware design exams, (vcap-dcd, vcix-dcv-design) they are fundamental in calculating available capacity given a specific number of tolerable host failures What percentage of cluster resources does your cluster still have to start VM’s in the event of a failure with x admission control reservation. In other words, after setting admission control (see […]

vcix-dcv-design math – Get admission control percentage

VMware are clear about the importance of setting admission control on vSphere clusters, and the preference of using the percentage calculation where possible A simple formula will help calculate for heterogeneous cluster*    For example I have a 12 node vsphere cluster and want to tolerate the loss of 4 hosts 100 / <number of hosts […]